An A/F ratio value below 11.5:1 is, IMHO, a sad attempt to cool the chamber down under very high boost conditions.
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'71 Mustang - C90E 408W @ 9.6:1 CR, N/A
'89 5.0L Mustang: Dart block based 2.2L Blowzilla supercharged combo @ 8.5:1 CR
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